Suboptimal control for drag reduction via suppression of near-wall Reynolds shear stress

Koji Fukagata, Nobuhide Kasagi

研究成果: Article査読

31 被引用数 (Scopus)

抄録

We propose a new suboptimal control law for drag reduction in wall-turbulence, which requires the streamwise wall-shear signal only. The cost function is designed to reduce the near-wall Reynolds shear stress that is directly related to the turbulent skin friction drag. The suboptimal solution to minimize the cost function is analytically derived by using the procedure proposed by Lee et al. [J. Fluid Mech. 358 (1998) 245]. Direct numerical simulation of turbulent pipe flow shows that the friction drag can be successfully reduced by the derived control law. Moreover, the sign of Reynolds shear stress in the near-wall layer is found to be reversed with the present control.

本文言語English
ページ(範囲)341-350
ページ数10
ジャーナルInternational Journal of Heat and Fluid Flow
25
3
DOI
出版ステータスPublished - 2004 6月
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学
  • 流体および伝熱

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